IssueTracker

• Jetpack Compose version: 1.7.2
• Material Library Version (M2, M3 or Both?): 1.7.2
• Material Compose component used: material-navigation:1.7.0-beta01
• Kotlin version: 1.9.23

We're observing random crashes within BottomSheetNavigator when user tries to press (we assume) system back. Unfortunately we do not have any repro steps for now as it happens to margin of users, without any clear distinction for Android version / manufacturer.

The stack trace points to retainedEntry!! usage, which in turn seems like a race condition:

if (retainedEntry != null) {
    LaunchedEffect(retainedEntry) {
        sheetState.show()
    }

    BackHandler {
        state.popWithTransition(popUpTo = retainedEntry!!, saveState = false)
    }
}

I know the same issue has been already reported about it back when this code was within accompanist library, linking those here:

• https://github.com/google/accompanist/issues/1750
• https://github.com/google/accompanist/issues/1733

Stack trace (if applicable):

Fatal Exception: java.lang.NullPointerException:
  at androidx.compose.material.navigation.BottomSheetNavigator$sheetContent$1$2$1.invoke(BottomSheetNavigator.java:182)
  at androidx.compose.material.navigation.BottomSheetNavigator$sheetContent$1$2$1.invoke(BottomSheetNavigator.java:181)
  at androidx.activity.compose.BackHandlerKt$BackHandler$backCallback$1$1.handleOnBackPressed(BackHandler.kt:89)
  at androidx.activity.OnBackPressedDispatcher.onBackPressed(OnBackPressedDispatcher.kt:279)
  at androidx.activity.ComponentActivity.onBackPressed(ComponentActivity.kt:612)
  at com.whatnot.MainActivity.onBackPressed(MainActivity.kt:212)
  at android.app.Activity.onKeyUp(Activity.java:4180)
  at android.view.KeyEvent.dispatch(KeyEvent.java:3529)
  at android.app.Activity.dispatchKeyEvent(Activity.java:4528)
  at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.kt:103)
  at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:85)
  at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.kt:117)
  at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:604)
  at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
  at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3397)
  at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:696)
  at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:8559)
  at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:8419)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:7752)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:7809)
  at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:7775)
  at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:7978)
  at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:7783)
  at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:8035)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:7756)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:7809)
  at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:7775)
  at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:7783)
  at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:7756)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:7809)
  at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:7775)
  at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:8011)
  at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:8253)
  at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:4596)
  at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:4030)
  at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:4021)
  at android.view.inputmethod.InputMethodManager.-$$Nest$mfinishedInputEvent()
  at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:4573)
  at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:154)
  at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
  at android.os.MessageQueue.next(MessageQueue.java:335)
  at android.os.Looper.loopOnce(Looper.java:187)
  at android.os.Looper.loop(Looper.java:319)
  at android.app.ActivityThread.main(ActivityThread.java:9063)
  at java.lang.reflect.Method.invoke(Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:588)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)